Ubuntu 15.04 connects to LAN but not internet

From my Google search, I'm not alone with this issue.  Machine automatically updated to 14.04, now it will not access the internet.  I'm not very conversant with Linux, but I have verified I can ping the following: (default route)

But I cannot ping an address, like www.Google.com.  When I do, I get

unknown host google.com

The info under Active Network Connections looks normal.
Mike CaldwellConsultant to IP industryAsked:
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In the terminal run netstat -rn to see the routing table.

Can you ping the gateway?
Do you have firewall (sfw) configured?

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Mike CaldwellConsultant to IP industryAuthor Commented:
Well, runstat is not installed.  I can't install it because of no internet access!

Lots of complaints on Google about this very issue with 15.04, so I think I am just going to start over and install 14.04 from scratch, and set it to never update.  My use of this machine is very little and not very important, so I don't need to keep it current; if it works, it works.
Mike CaldwellConsultant to IP industryAuthor Commented:
And yes I can ping the gateway (default route).  I have no idea about the firewall or sfw; not experienced enough to know.  But really, I'm going to forget about fixing it and just go back to the earlier rev that worked fine.
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sounds like the dns isn't set correct.
Mike CaldwellConsultant to IP industryAuthor Commented:
TobiasHolm: OK, then how do I set the DNS correctly?  I'm a Linux rookie, so would need step by step instructions.
view contents of /etc/resolv.conf
It should have one or several entries in the form:
Nameserver ip_of_name_server

Is the system use static ip or it gets IP from DHCP server?
If static, add the entry
As it seems you want to use google's name server.
Or you can use the DNS IPs from your ISP provider.
Once the above is added, it should work.

When you run nslookup, what server/ip is reflected?
Open up a new question since this is already closed with points assigned.
Mike CaldwellConsultant to IP industryAuthor Commented:
I still see it in my open questions list.  I'll start a new one, but this one was not really completed, but fine with me if it can be close out.  The system is not offering me that option.
It is closed, but it is still on your monitor list such that anytime anyone posts to it all participants are notified.
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